It just looks very large for a generator to me, and I would think quite expensive. To make an educated guess one would have to compare the cost to build vs a traditional windmill. Difficult to say anything more without this. Because otherwise its just a different hawt.
I know the Norwegian startup Sway did something similar, though they did not take it as far, and failed. Maybe not for reasons of the design though, I dont know.
Actually Im not even sure they failed, the company seems to still be alive…